 /* 遮罩层 */
 #overlay {
  position: fixed;
  left: 0px;
  top: 0px;
  width: 100%;
  height: 100%;
  font-size: 16px;
  /* IE9以下不支持rgba模式 */
  background-color: rgba(0, 0, 0, 0.5);
  /* 兼容IE8及以下 */
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#7f000000,endColorstr=#7f000000);
  display: none;
}
/* 弹出框主体 */
.popup {
  background-color: #ffffff;
  max-width: 400px;
  min-width: 200px;
  height: 240px;
  border-radius: 5px;
  margin: 18% auto;
  text-align: center;
}
/* 弹出框的标题 */
.popup_title {
  height: 60px;
  line-height: 60px;
  border-bottom: solid 1px #cccccc;
}
/* 弹出框的内容 */
.popup_content {
  height: 50px;
  line-height: 50px;
  padding: 15px 20px;
}
/* 弹出框的按钮栏 */
.popup_btn {
  padding-bottom: 10px;
}
/* 弹出框的按钮 */
.popup_btn button {
  color: #778899;
  width: 40%;
  height: 40px;
  cursor: pointer;
  border: solid 1px #cccccc;
  border-radius: 5px;
  margin: 5px 10px;
  color: #ffffff;
  background-color: #337ab7;
}
.showButton{
  position: fixed;
  right: 30px;
  bottom: 30px;
  z-index: 2;
}

.happyImg{
  width: 70px;
  height: 70px;
}

.happyImg:hover{
  content: url(../img/icon/Expression_12.png);
  cursor: pointer;
}